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#include <errno.h>
#include <nss.h>
#include <pthread.h>
#include <string.h>
#define COPY_IF_ROOM(s) \
({ size_t len_ = strlen (s) + 1; \
char *start_ = cp; \
buflen - (cp - buffer) < len_ \
? NULL \
: (cp = mempcpy (cp, s, len_), start_); })
/* Password handling. */
#include <pwd.h>
static struct passwd pwd_data[] =
{
#define PWD(u) \
{ .pw_name = (char *) "name" #u, .pw_passwd = (char *) "*", .pw_uid = u, \
.pw_gid = 100, .pw_gecos = (char *) "*", .pw_dir = (char *) "*", \
.pw_shell = (char *) "*" }
PWD (100),
PWD (30),
PWD (200),
PWD (60),
PWD (20000)
};
#define npwd_data (sizeof (pwd_data) / sizeof (pwd_data[0]))
static size_t pwd_iter;
#define CURPWD pwd_data[pwd_iter]
static pthread_mutex_t pwd_lock = PTHREAD_MUTEX_INITIALIZER;
enum nss_status
_nss_test1_setpwent (int stayopen)
{
pwd_iter = 0;
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_test1_endpwent (void)
{
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_test1_getpwent_r (struct passwd *result, char *buffer, size_t buflen,
int *errnop)
{
char *cp = buffer;
int res = NSS_STATUS_SUCCESS;
pthread_mutex_lock (&pwd_lock);
if (pwd_iter >= npwd_data)
res = NSS_STATUS_NOTFOUND;
else
{
result->pw_name = COPY_IF_ROOM (CURPWD.pw_name);
result->pw_passwd = COPY_IF_ROOM (CURPWD.pw_passwd);
result->pw_uid = CURPWD.pw_uid;
result->pw_gid = CURPWD.pw_gid;
result->pw_gecos = COPY_IF_ROOM (CURPWD.pw_gecos);
result->pw_dir = COPY_IF_ROOM (CURPWD.pw_dir);
result->pw_shell = COPY_IF_ROOM (CURPWD.pw_shell);
if (result->pw_name == NULL || result->pw_passwd == NULL
|| result->pw_gecos == NULL || result->pw_dir == NULL
|| result->pw_shell == NULL)
{
*errnop = ERANGE;
res = NSS_STATUS_TRYAGAIN;
}
++pwd_iter;
}
pthread_mutex_unlock (&pwd_lock);
return res;
}
enum nss_status
_nss_test1_getpwuid_r (uid_t uid, struct passwd *result, char *buffer,
size_t buflen, int *errnop)
{
for (size_t idx = 0; idx < npwd_data; ++idx)
if (pwd_data[idx].pw_uid == uid)
{
char *cp = buffer;
int res = NSS_STATUS_SUCCESS;
result->pw_name = COPY_IF_ROOM (pwd_data[idx].pw_name);
result->pw_passwd = COPY_IF_ROOM (pwd_data[idx].pw_passwd);
result->pw_uid = pwd_data[idx].pw_uid;
result->pw_gid = pwd_data[idx].pw_gid;
result->pw_gecos = COPY_IF_ROOM (pwd_data[idx].pw_gecos);
result->pw_dir = COPY_IF_ROOM (pwd_data[idx].pw_dir);
result->pw_shell = COPY_IF_ROOM (pwd_data[idx].pw_shell);
if (result->pw_name == NULL || result->pw_passwd == NULL
|| result->pw_gecos == NULL || result->pw_dir == NULL
|| result->pw_shell == NULL)
{
*errnop = ERANGE;
res = NSS_STATUS_TRYAGAIN;
}
return res;
}
return NSS_STATUS_NOTFOUND;
}
enum nss_status
_nss_test1_getpwnam_r (const char *name, struct passwd *result, char *buffer,
size_t buflen, int *errnop)
{
for (size_t idx = 0; idx < npwd_data; ++idx)
if (strcmp (pwd_data[idx].pw_name, name) == 0)
{
char *cp = buffer;
int res = NSS_STATUS_SUCCESS;
result->pw_name = COPY_IF_ROOM (pwd_data[idx].pw_name);
result->pw_passwd = COPY_IF_ROOM (pwd_data[idx].pw_passwd);
result->pw_uid = pwd_data[idx].pw_uid;
result->pw_gid = pwd_data[idx].pw_gid;
result->pw_gecos = COPY_IF_ROOM (pwd_data[idx].pw_gecos);
result->pw_dir = COPY_IF_ROOM (pwd_data[idx].pw_dir);
result->pw_shell = COPY_IF_ROOM (pwd_data[idx].pw_shell);
if (result->pw_name == NULL || result->pw_passwd == NULL
|| result->pw_gecos == NULL || result->pw_dir == NULL
|| result->pw_shell == NULL)
{
*errnop = ERANGE;
res = NSS_STATUS_TRYAGAIN;
}
return res;
}
return NSS_STATUS_NOTFOUND;
}
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